Band dividing/synthesizing filter with reduced memory requiremen

Details Band dividing/synthesizing filter with reduced memory requiremen Band dividing/synthesizing filter with reduced memory requiremen

1996-11-07

2000-02-22

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

704229, 704204, G10L 900

Patent

active

060291362

ABSTRACT:
A coding process having a band dividing filter and a decoding process having a subband synthesizing filter are arranged so that the operating accuracy is enhanced only in a specific subband, for securing the necessary sound quality with a relatively small amount of the operation. A band dividing control unit is served to derive a signal level of each subband from the output result of a fast band dividing filter and generate a high-accurate operation band specifying command for specifying a subband of a low signal level. A high-accuracy band dividing filter is executed to perform a band dividing operation for the subband of the low signal level specified by the high-accuracy band specifying command.

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